Video Editing

Youtube has video editing tools that are free. Upload all the videos to youtube and you can edit from there.

http://www.magisto.com/
Another video editing web app

https://www.filelab.com/

There may be other good ones here:
http://webseasoning.com/technology/10-best-and-free-online-video-editing-software/1066/#.UG8zv5jA-Qw

Audio Editing

https://www.filelab.com/

http://soundation.com/

http://remixer.clubcreate.com/v2/musiclab/launch.html